The film will be released in 3D in 2015. The book — which centers on a squirrel’s quest to find a fabled animal sanctuary called Animalia — is written by McCartney, Geoff Dunbar and Philip Ardagh.

McCartney will compose several original songs for the film. Tony Bancroft, whose credits include “Mulan,” will direct the feature from a screenplay by Josh Klausner (“Shrek Forever After”). Evolution will spearhead the global licensing and merchandising campaign for the film.

Lynne said, “We know how special this project is for Sir Paul and how excited he is to be a part of this wonderful, creative collaboration.”

RGH’s Randa Ayoubi and David Corbett are serving as executive producers.

“’High in the Clouds’ is a passion project for me,” McCartney said in a statement. “I am thrilled to be working in partnership with Randa Ayoubi and David Corbett at RGH, and David Michael Lynne and Bob Shaye of Unique Features. Working with the highly creative talent at these companies together with Josh Klausner and Tony Bancroft, we will be able to create a warm, funny and moving animated film that will resonate with worldwide audiences.”